Patent US3909192A successfully refreshed from Google Patents.
US3909192A
Expired / Lapsed
US
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Stable liquid dyestuff preparations
Assignee: Sandoz AG
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Filing: 1972-08-23
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Granted: 1975-09-30
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Expires: 1992-08-23
Abstract
Abstract The invention provides novel stable, liquid dyestuff preparations comprising (a) at least one basic dyestuff of the polymethine series present in the form of a salt of an inorganic acid or of an alkylsulphuric acid in which the alkyl radical contains 1 to 4 carbon atoms, (b) at least one water-soluble organic acid and (c) gamma -butyrolactone. The preparations are useful for dyeing polyacrylonitrile, acrylonitrile copolymer, polyester and polypropylene fibres.
Inventors
- 👤 Berthold Gertisser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:33
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/70; D06P3/76; C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0075; C09B67/0076; D06P3/34; D06P3/52; D06P3/522; D06P3/79; D06P3/792
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
19 words
A STABLE LIQUID DYESTUFF COMPOSITION COMPRISING 20 TO 25% BY WEIGHT OF A BASIC DYESTUFF SALT OF THE FORMULA
Claim 2
Dependent Claim
19 words
A STABLE LIQUID DYESTUFF COMPOSITION COMPRISING 20 TO 25% BY WEIGHT OF A BASIC DYESTUFF SALT OF THE FORMULA
Claim 3
Dependent Claim
47 words
The composition of claim 1, which comprises from 20 to 25% by weight of the basic dyestuff, from 4 to 13% by weight of the gamma -butyrolactone, from 62 to 68% by weight of the water-soluble organic acid and from 0 to 13% by weight of water.
Claim 4
Dependent Claim
27 words
A composition according to claim 2 wherein Xn is the anion of sulphuric or hydrochloric acid or of an alkylsulphuric acid of 1 to 2 carbon atoms.
Claim 5
Dependent Claim
14 words
The composition of claim 1, in which the basic dyestuff salt is of formula
Claim 6
Dependent Claim
37 words
A composition according to claim 3 wherein any alkyl group on ring A of the dyestuff contains 1 to 4 carbon atoms and any alkoxy group on ring A or B contains 1 to 3 carbon atoms.
Claim 7
Dependent Claim
18 words
A composition according to claim 5 wherein any alkyl group on ring A of the dyestuff is unsubstituted.
Claim 8
Dependent Claim
18 words
A composition according to claim 2 wherein the water-soluble organic acid is formic, acetic, propionic or benzoic acid.
Claim 9
Dependent Claim
13 words
A coMposition according to claim 2 wherein the dyestuff is of the formula
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |